A wave of heavy rain with possibly embedded thunder continues to moves northeast along the I-70 corridor, and will soak the Indianapolis metro the next few hours.
This is just the beginning of a very wet 24 hours in Central Indiana. All of the region is under a Flood WATCH until 7am Sunday, with a heightened risk of flooding due to snow melt, a frozen ground and excessive rainfall forecast.
Many locations along and south of I-70 will see a month's worth of rain between now and Sunday at 1am… and rain rates may near 1″ an hour at times Saturday afternoon.
There's also a risk of strong to severe storms south of I-70 Saturday evening for damaging wind and brief tornado spin-ups. It's likely that for only the 2nd time since 1871, Indianapolis will exceed 2.5″ of rain on a December day… and possibly rival the all-time daily December record that was set in 1873!